body{
    margin: 0;
    padding: 0;
}
ul,li{
    margin: 0;
    padding: 0;
}
#content{
    width: 380px;
    padding: 0;
    margin: 0;
    overflow: hidden;
    font-size: 12px;
    line-height: 25px;
    border: 1px solid red;
}
#content ul{
    position: relative;
}
.tipText,.tipBg{
    position: absolute;
    width: 380px;
    height: 25px;
    top: 280px;
}
.tipBg{
    background: black;
    opacity: 50%;
}
.tipText{
    z-index: 999;
    color: white;
}